Calendar



{No Model.)

AQSACHS. CALENDAR.

Patented June 14, 1892.

a central pivot.

UNITED STATES PATENT OFFICE.

ALBERT sAcns, or HAMILTON, 01-110.

CALEN DAR.

SPECIFICATION forming part of Letters Patent No. 476,929, dated June 14, 1892.

Application filed February 23, 1892. Serial No. 22,475. (N0 model.)

To ctZZ whom it may concern.-

Be itknown that I, ALBERT SACHS, of Hamilton, Butler county, Ohio, have invented certain new and useful Improvements in Perpetual Calendars, of which the following is a specification.

My invention relates to that class of perpetual calendars composed of a plural number of circular disks having appropriate characters inscribed thereon, centrallypivoted together, and adapted, respectively, to radial adjustment; and the objects of my improvements are to correctly indicate any date within a stated period of time by the special arrangement of the characters on the various disks and the manner in which the disks are radially or axially adjusted, respectively, on These objects are attained in the following described manner, as illustrated in the accompanying drawings, in which- Figure 1 is a front View of the calendaradjusted to indicate the month of February. Fig. 2 is a rear view of the same adjusted for the year 1892. Fig. 3 is a front view of intermediate disk B. Fig. 4 is a rear view of intermediate disk D. Fig. 5 is a front View of the section of a disk resembling a sector. Fig. 6 shows edgewise the respective disks composing the calendar arranged in their proper order to be connected by rivet F, but

than disk A to receive on its face margin the slightly separated.

In the drawings, A represents the front disk of the calendar and is shown in place in Fig. 1. It is of the same diameter as disks B and sector 0, and the numerical characters from 1 to 30, inclusive, are inscribed on its front marginal surface in regular order from left to right to indicate the number of respective days of the month. A gap or notch G is made in its edge immediately after the number 30, to permit the number 31 on the margin of disk 13, placed immediately thereunder, to be respectively sh own through said gap.

H represents a slot cut through disk A, through which may be shown, respectively, the names of the months on disk B and sector C thereunder.

I is a lip extended from the edge of disk A, by which it may be turned to a desired position.

Disk B is perforated by an opening J in the form of a sector to expose the names Jan. and Feb. on sector 0 thereunder. It is provided with lip K, extended from its edge, by which it may be turned, and gap or notch L is made in its edge to receive guide M of sector 0. Its front face is inscribed with the names of the days of the last ten months of the year, together with the numbers 31 in their respective situations, as shown in Fig.

Disk or sector 0 is located under the opening J in disk B, and is provided with guide M, turned up from its edge to engage the edge of disk B in notch or recess L, to permit the radial adjustment of disk B thereon to the extent of one of the marginal numbers on disk A.

N is an arm extending radially from the edge of sector 0, having a portion of each of its side edges turned downwardly to form hooks or flanges 0, vertical to the plane of said sector and arm, and adapted to engage with disks D and E through the notches in the edges thereof. Said arm is provided with opening P to increase its flexibility and to show the days of the week on disk D there under.

On the front face of sector 0 is inscribed the characters Jan. and Feb, to repre sent the first two months of the year.

Disk D is of sufficiently greater diameter abbreviated days of the week in five successive series, extending from left to right, respectively, coinciding with the numbers for the days of the month on the margin of disk A, and on its rear marginal surface is inscribed the several numbers representing centuries, as shown in Fig. 4. Its edgeis formed with a series of thirty-five narrow notches located at the extremity of radii passing between the days of the week on its face, said notches being adapted to receive the hooks O of arm N.

Disk E is devoid of characters on its front face, but its rearsurface contains the numeral characters from O to 99 inclusive, arranged from right to left in concentric circles and spaced by intersecting radial lines, as shown in Fig. 2.

Notch or gap R is made in its edge to show the respective numbers of the centuries on both.

disk D. Its edge is also formed with a series of thirty-five small notches to coincide with those of disk D, and adapted to also engage with hooks O.

Lug K, together with all the nu meralcharacters marked with a small r, is to be used for leap-years, and should be red or some other uniform color-differentfrom that of the remaining characters.

The several disks are to be pivoted together by central rivet F in the order shown in Fig. 6. lVashers may be interposed between them, if desired. 7

To adjust the calendar for any date, arm N is lifted to detach hooks 0 from the notches in the edges of disks D and E. Disk E is then turned on its center until the numberon the margin of disk D, representing the desired century, is seen through gap B, when arm N is brought in a radial line with the number on the rear of disk E, which repre sents the desired year of the century. Hooks O are now engaged in the notchesin the edges of disks D and E, terminating the radii that inclose the said number of the year. The adjustment is now completed for the year selected. Disk A is now turned 011 pivot F until the name of the desired month is exposed through slotll, said name being inscribed on either disk 15 or 0. Should the year chosen be a leap-year, it will be so indicated by the red or other special color of either the number representing the year on disk E or the number representing the century on disk D, sometimes as is evident by When leap-years are so indicated, disk B must be turned to the right on sector G to the limit of notch L, when lip K will radially coincide with number 29- on disk A, with which it agrees in color and which number represents the last day of February on leap-years. This adjustment turns the months succeeding February one day later to allow for February 29. For the same reasons on years or centuries not leap-years disk 13 should be turned to the left to the limit of notch L, when said lip K will radially coincide with the number 28 on disk A.

In the foregoing manner the calendar will be adjusted for any desired month and year, when the day of the month on disk A will radially coincide with the day of the week on the face margin of disk D. \Vhen slot 11 exposes the name of a month of thirtybne days, a respective number 31 on the margin of disk B will appear through gap G in the edge of disk A, immediately after number 30 thereon.

The numbers representing centuries on the margin of disk D may all be omitted except the characters 0, 1, 2, and 3. The 0 is to be used for leap-year centuries, being those that are evenly divisible by four hundred. The numbers 1, 2, and 3 are to be used, respectively, when they represent the number of hundreds of the remainder re sulting from a division of the number of any century by said four hundred. The calendar is thus substantially perpetual, as the datesfor which it is adapted are without reasonable limit.

Disks B and 0 taken together are substam tially one adjustable disk by which the last ten months of the year thereon inscribed may be turned forward one day to compensate for February 29 of leap-years. By making sector O a complete disk instead of a sector it will fill the entire space between disks B and D, which is desirable. The several disks are preferably of a plain surface and circular in form, but not necessarily so. They may be composed of sheetbrass, aluminum, or other metal, or of celluloid, card-board, or any other appropriate material, and the characters may be printed, stamped, or inscribed thereon in any manner desired. The central pivot may be adjustable to regulate the friction between the disks, when the notches may be omitted from the edges of disks D and E, and also the hooks O on arm N.

Having thus fully described my invention,

what I claim, and desire to secure by Letters Patent, is-

-1. A calendar comprising a series of disks rotatably secured upon each other at a common center, the rear disk being provided with a notch in its edge and numbers arranged radially and concentrically upon its surface to indicate the different years of the different centuries, and the next to the rear disk being provided with numbers arranged concentrically to register with the notch in the rear disk to indicate the number of the century, and the front disks being provided with means for indicating the months and days, substan tially as set forth.

2. A calendar comprising a series of disks rotatably secured upon each other at a common center, the rear disks being provided with slits in their outer edges which register with each other, and the outer disk being provided with a notch or a cut-away portion between two of said slits, also with numbers arranged radially and concentrically upon its outer surface to indicate the years of the century, and the other disk being provided with numbers arranged concentrically upon its face to register with the notch of the outer disk to indicate the number of the century, and the front disks being provided with means for indicating the month and days of the year, and one of them being also provided with an arm extending out to the edge of the rear disk and provided with hooks which are adapted to engage with the slits in the edges of the rear disks, substantially as set forth.

3. A calendar comprising a series of disks rotatably secured upon each other at a com mon center, the rear disks being provided with means for indicating the century and the number of the year of the century and the front side of one of said disks being provided with the names of the days of the week arranged concentrically around its outer edge,

and the front disks being of a less diameter than the rear disks, and the outer one of said front disks being provided with two openings and a series of numbers around its outer edge to correspond with the names of the days upon the rear disk, and the next to the outer disk being provided with the names of the months of the years and with characters to indicate the last day of the month, said characters and names of the months being visible through the openings in the outer disk, substantially as set forth.

4. A calendar comprising a series of disks rotatably secured upon each other at a 00111- mon center, the rear disks being provided with means for indicating the number and years of the centuries and the front surface of one of them beingprovided with the names of the days of the Week, and the front disks being of less diameter than the rear disks and provided with names for indicating the months and days, the names of the months bein g upon two disks, one of which is stationary relatively to the rear disks and the other one is movable relatively thereto one space, whereby the month following January and February can be moved one space forward for leap-year, substantially as set forth.

5. A calendar comprising a series of disks rotatably secured upon each other at a common center, the rear disks being provided with means for indicating the number and years of the century and one of them being provided upon its front surface with the names of the days of the week, and the front disks being of a less diameter than the rear disks and provided with means for indicating the names of the months and the number of days of the month, the names of the months being upon two disks, one of which is provided with means for attaching it to the rear disk and with a catch for engaging with the intermedi ate front disk, said intermediate front disk being provided with a notched edge to be engaged by the catch of the lower front disk, whereby it may be rotated one space for leapyear, and being also provided with a projection for rotating it and indicating the odd day in leap years, and also with openings through which the names of the months upon the lower disks may be seen, and the outer front disk being provided with two openings, through which the names of the months upon the other disks may be seen, and also the character upon the intermediate front disk to indicate the last day of the month, substantially as set forth.

6. A calendar comprising a series of disks rotatably secured upon each other at a common center, the rear disk being provided with the names of the days of the Week and the front disks being of less diameter than the rear disk and provided with numbers from one to thirty to register with the names of the days of the week of the rear disk, and the intermediate front disks being provided with the names of the months and with characters to indicate the last day of the month, the lower one of said intermediate disks being adaptedto be secured to the rear disk and the next intermediate disk being rotatable one space relatively thereto to indicate leap- I year, said front disk and the next one thereto each being provided with openings through which the names of the months and the character for the last day of the month can be seen, substantially as set forth.

ALBERT SACHS,

Witnesses:

A. S. HAMMERLE, CHAs. SACHS, 

